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Finding the Fourth Proportional to 71.88, 107.84 and 31.28

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Solution

The fourth proportional to 71.88, 107.84 and 31.28 is: 46.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 107.84 = 31.28 : x
  2. Step 2: Convert to fraction form
    71.88/107.84 = 31.28/x
  3. Step 3: Cross multiply
    71.88x = 107.84 × 31.28
  4. Step 4: Simplify right side
    71.88x = 3,373.24
  5. Step 5: Solve for x
    x = 3,373.24/71.88
  6. Step 6: Final answer
    x = 46.93

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